Write fingerprints.json file.

Example (reformatted using JSONLint):

[
    {
        "nickname": "gabelmoo",
        "fingerprint": "F2044413DAC2E02E3D6BCF4735A19BCA1DE97281"
    },
    {
        "nickname": "moria1",
        "fingerprint": "9695DFC35FFEB861329B9F1AB04C46397020CE31"
    },
    {
        "nickname": "ndnop2",
        "fingerprint": "DE6397A047ABE5F78B4C87AF725047831B221AAB"
    }
]
- removed json provider server
- changed combined-*.json loading
- added loading participants from json file
- added hiding participant list by default
- some style changes
- fixed linting
- copied globe compute3days period
- added timeWindow [now - period, now]
- fixed client stats
- updated readme